8" x 36" or 36" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 38.5"] White unrestricted airflow with a precise

unrestricted airflow with a precise 50° angled design

Actual Front End Outer Dimensions Are 12" Diameter

+ Product Details Size - 26"w X 26"h is the size for the duct opening measurement only

+ Product Details Size - 6" X 6" is the size for the duct opening measurement only

+ Product Details Size - 32"w X 34"h is the size for the duct opening measurement only

8" x 36" or 36" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 38.5"] White unrestricted airflow with a precise+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 36" or 36" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 35. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum